--- title: "B Lock Penstocks Replacement" ocid: "ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560" markdown_url: "https://d3tenders.com/contract/ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560.md" json_url: "https://d3tenders.com/contract/ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560.json" source: "Contracts Finder" current_stage: "Tender" buyer: "KBS MARITIME LTD" published: "2026-05-20" --- # B Lock Penstocks Replacement Buyer: KBS MARITIME LTD Current stage: Tender OCID: ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560) [Download OCDS JSON](https://d3tenders.com/contract/ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560.json) ## Summary KBS Maritime Ltd is inviting tenders for the "B Lock Penstocks Replacement" project at the Portsmouth Naval Base. This procurement is in the Tender stage, with a selective procurement method using a restricted procedure. The industry categories involved include penstock valves, culverts, sluice valves, flood-control valves, and valve actuators. The tender was published on 20th May 2026, and submissions are due by 18th June 2026. The contract work is scheduled to begin in December 2026 and conclude by February 2030. The project has a contract value of £3,500,000 to £5,000,000 and spans various locations, including the United Kingdom and other designated territories. This tender presents significant opportunities for businesses involved in the manufacture and installation of penstock systems and associated infrastructure in marine environments. It is especially suitable for small and medium-sized enterprises with at least five years of experience in similar projects, demonstrating robust capabilities in design, manufacture, and site management under Health and Safety regulations. Companies excelling in valve technology, repair, and maintenance services might find this tender particularly aligned with their expertise, promoting substantial business growth within the maritime sector. ## Notice KBS Maritime have a requirement for penstock replacements at B Lock within Portsmouth Naval Base. The project consists of 10 in number replacement penstocks in 6 chambers overall. The penstock system controls sea water via a culvert system between the harbour, the basin and the dry docks. These include levelling penstocks of circa 8 metres deep to drainage penstocks circa 18 metres deep. The replacement programme will replace the current cast irons doors with new with specification to be agreed along with the associated shafts, wedges, door nut, brackets, platforms, ladders and actuation and road plates. This project is due to commence in Q4 2026 with all to be replaced by Feb 2030. Contractors must be able to demonstrate design, manufacture and installation of penstock replacements in a marine environment including all site management under CDM regulations and competency of Health and Safety compliance and safe practices. Contractors must also possess at least five years' experience working within a marine environment. Contractors who do not provide suitable and sufficient evidence of this will not be considered ## Key Details | Field | Value | | --- | --- | | Publication source | Contracts Finder | | Latest notice | https://www.contractsfinder.service.gov.uk/Notice/b761e5b8-1c74-4a82-a2c9-ed1d0436af5f | | Notice type | Tender Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Selective | | Procurement method details | Restricted procedure | | Tender suitability | SME | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 20 May 2026 | | Submission deadline | 18 Jun 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | 1 Dec 2026 - 28 Feb 2030 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £5,000,000 | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Active | | Lots status | Not specified | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | KBS MARITIME LTD | | Locality | PORTSMOUTH | | Post town | Portsmouth | | Postcode | PO1 3LS | | Country | England | | ITL 1 | TLJ South East (England) | | ITL 2 | TLJ3 Hampshire and Isle of Wight | | ITL 3 | TLJ31 Portsmouth | | Local authority | Portsmouth | | Electoral ward | Charles Dickens | | Westminster constituency | Portsmouth South | | Delivery location | Not specified | ## CPV Codes ### Divisions - 42 - Industrial machinery - 45 - Construction work - 50 - Repair and maintenance services ### Codes - 42131120 - Sluice valves - 42131143 - Flood-control valves - 42131220 - Penstock valves - 42132100 - Valve actuators - 42132110 - Electric valve actuators - 42132120 - Hydraulic valve actuators - 42132130 - Pneumatic valve actuators - 45221220 - Culverts - 50510000 - Repair and maintenance services of pumps, valves, taps and metal containers ## Release History - 20 May 2026 at 09:01 - Tender - Tender Notice - https://www.contractsfinder.service.gov.uk/Notice/b761e5b8-1c74-4a82-a2c9-ed1d0436af5f ## Documents - https://www.contractsfinder.service.gov.uk/Notice/b761e5b8-1c74-4a82-a2c9-ed1d0436af5f 20th May 2026 - Opportunity notice on Contracts Finder - https://uk.eu-supply.com/ctm/supplier/publictenders?B=KBS Please follow link to express an interest in this opportunity - https://uk.eu-supply.com/ctm/Company/CompanyInformation/Index/153032 User / Company ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-b5fd17-460a065c-7694-4e69-a1aa-9b4f193fa560.json.